Bundle branch block
DEFINITION
Bundle branch block is a condition in which there’s a delay or obstruction along the pathway that electrical impulses travel to make your heart beat. The delay or blockage may occur on the pathway that sends electrical impulses to the left or the right side of the bottom chambers (ventricles) of your heart.
Bundle branch block sometimes makes it harder for your heart to pump blood efficiently through your circulatory system.
There’s no specific treatment for bundle branch block itself. However, any underlying health condition that caused bundle branch block, such as heart disease, will need to be treated.
CAUSES
- Heart disease
- Thickened, stiffened or weakened heart muscle (cardiomyopathy)
- A viral or bacterial infection of the heart muscle (myocarditis)
- High blood pressure (hypertension)
- A heart abnormality that’s present at birth (congenital) — such as atrial septal defect, a hole in the wall separating the upper chambers of the heart
- A heart attack (myocardial infarction)
- A viral or bacterial infection of the heart muscle (myocarditis)
- High blood pressure (hypertension)
- A blood clot in the lungs (pulmonary embolism)
SYMPTOMS
- Fainting (syncope)
- Feeling as if you’re going to faint (presyncope)
- If you’ve fainted, see your doctor to rule out any serious, underlying causes.
- If you have heart disease, or if your doctor has already diagnosed you as having bundle branch block, ask your doctor how often you should have follow-up visits. You might want to carry a medical alert card that identifies you as having bundle branch block in case you’re seen in an emergency by a doctor who isn’t familiar with your medical history.